// Copyright 2013 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef V8_LIBPLATFORM_DEFAULT_PLATFORM_H_
#define V8_LIBPLATFORM_DEFAULT_PLATFORM_H_

#include <functional>
#include <map>
#include <memory>
#include <queue>
#include <vector>

#include "include/libplatform/libplatform-export.h"
#include "include/libplatform/libplatform.h"
#include "include/libplatform/v8-tracing.h"
#include "include/v8-platform.h"
#include "src/base/compiler-specific.h"
#include "src/base/macros.h"
#include "src/base/platform/mutex.h"
#include "src/base/platform/time.h"

namespace v8 {
namespace platform {

    class Thread;
    class WorkerThread;
    class DefaultForegroundTaskRunner;
    class DefaultWorkerThreadsTaskRunner;
    class DefaultPageAllocator;

    class V8_PLATFORM_EXPORT DefaultPlatform : public NON_EXPORTED_BASE(Platform) {
    public:
        explicit DefaultPlatform(
            IdleTaskSupport idle_task_support = IdleTaskSupport::kDisabled,
            std::unique_ptr<v8::TracingController> tracing_controller = {});

        ~DefaultPlatform() override;

        void SetThreadPoolSize(int thread_pool_size);

        void EnsureBackgroundTaskRunnerInitialized();

        bool PumpMessageLoop(
            v8::Isolate* isolate,
            MessageLoopBehavior behavior = MessageLoopBehavior::kDoNotWait);

        void RunIdleTasks(v8::Isolate* isolate, double idle_time_in_seconds);

        void SetTracingController(
            std::unique_ptr<v8::TracingController> tracing_controller);

        using TimeFunction = double (*)();

        void SetTimeFunctionForTesting(TimeFunction time_function);

        // v8::Platform implementation.
        int NumberOfWorkerThreads() override;
        std::shared_ptr<TaskRunner> GetForegroundTaskRunner(
            v8::Isolate* isolate) override;
        void CallOnWorkerThread(std::unique_ptr<Task> task) override;
        void CallDelayedOnWorkerThread(std::unique_ptr<Task> task,
            double delay_in_seconds) override;
        void CallOnForegroundThread(v8::Isolate* isolate, Task* task) override;
        void CallDelayedOnForegroundThread(Isolate* isolate, Task* task,
            double delay_in_seconds) override;
        void CallIdleOnForegroundThread(Isolate* isolate, IdleTask* task) override;
        bool IdleTasksEnabled(Isolate* isolate) override;
        double MonotonicallyIncreasingTime() override;
        double CurrentClockTimeMillis() override;
        v8::TracingController* GetTracingController() override;
        StackTracePrinter GetStackTracePrinter() override;
        v8::PageAllocator* GetPageAllocator() override;

    private:
        static const int kMaxThreadPoolSize;

        base::Mutex lock_;
        int thread_pool_size_;
        IdleTaskSupport idle_task_support_;
        std::shared_ptr<DefaultWorkerThreadsTaskRunner> worker_threads_task_runner_;
        std::map<v8::Isolate*, std::shared_ptr<DefaultForegroundTaskRunner>>
            foreground_task_runner_map_;

        std::unique_ptr<TracingController> tracing_controller_;
        std::unique_ptr<PageAllocator> page_allocator_;

        TimeFunction time_function_for_testing_;
        DISALLOW_COPY_AND_ASSIGN(DefaultPlatform);
    };

} // namespace platform
} // namespace v8

#endif // V8_LIBPLATFORM_DEFAULT_PLATFORM_H_
